function [FIFF, FWD] = fiff_define_constants()
% Authors: Alexandre Gramfort <alexandre.gramfort@inria.fr>
%          Matti Hamalainen <msh@nmr.mgh.harvard.edu>
%
% License: BSD (3-clause)

%
% Blocks
%
FIFF.FIFFB_ROOT               = 999;
FIFF.FIFFB_MEAS               = 100;
FIFF.FIFFB_MEAS_INFO          = 101;
FIFF.FIFFB_RAW_DATA           = 102;
FIFF.FIFFB_PROCESSED_DATA     = 103;
FIFF.FIFFB_EVOKED             = 104;
FIFF.FIFFB_ASPECT             = 105;
FIFF.FIFFB_SUBJECT            = 106;
FIFF.FIFFB_ISOTRAK            = 107;
FIFF.FIFFB_HPI_MEAS           = 108;  % HPI measurement
FIFF.FIFFB_HPI_RESULT         = 109;  % Result of a HPI fitting procedure
FIFF.FIFFB_HPI_COIL           = 110;  % Data acquired from one HPI coil
FIFF.FIFFB_PROJECT            = 111;
FIFF.FIFFB_CONTINUOUS_DATA    = 112;
FIFF.FIFFB_VOID               = 114;
FIFF.FIFFB_EVENTS             = 115;
FIFF.FIFFB_INDEX              = 116;
FIFF.FIFFB_DACQ_PARS          = 117;
FIFF.FIFFB_REF                = 118;
FIFF.FIFFB_IAS_RAW_DATA       = 119;
FIFF.FIFFB_IAS_ASPECT         = 120;
FIFF.FIFFB_HPI_SUBSYSTEM      = 121;
% FIFF.FIFFB_PHANTOM_SUBSYSTEM  = 122;
% FIFF.FIFFB_STATUS_SUBSYSTEM   = 123;
FIFF.FIFFB_DEVICE             = 124;
FIFF.FIFFB_HELIUM             = 125;
FIFF.FIFFB_CHANNEL_INFO       = 126;

FIFF.FIFFB_SPHERE             = 300;   % Concentric sphere model related
FIFF.FIFFB_BEM                = 310;   % Boundary-element method
FIFF.FIFFB_BEM_SURF           = 311;   % Boundary-element method surfaces
FIFF.FIFFB_CONDUCTOR_MODEL    = 312;   % One conductor model definition
FIFF.FIFFB_PROJ               = 313;
FIFF.FIFFB_PROJ_ITEM          = 314;
FIFF.FIFFB_MRI                = 200;
FIFF.FIFFB_MRI_SET            = 201;
FIFF.FIFFB_MRI_SLICE          = 202;
FIFF.FIFFB_MRI_SCENERY        = 203;    % These are for writing unrelated 'slices'
FIFF.FIFFB_MRI_SCENE          = 204;     % Which are actually 3D scenes...
FIFF.FIFFB_MRI_SEG            = 205;     % MRI segmentation data
FIFF.FIFFB_MRI_SEG_REGION     = 206;     % One MRI segmentation region
FIFF.FIFFB_PROCESSING_HISTORY = 900;
FIFF.FIFFB_PROCESSING_RECORD  = 901;

FIFF.FIFFB_DATA_CORRECTION    = 500;
FIFF.FIFFB_CHANNEL_DECOUPLER  = 501;
FIFF.FIFFB_SSS_INFO           = 502;
FIFF.FIFFB_SSS_CAL            = 503;
FIFF.FIFFB_SSS_ST_INFO        = 504;
FIFF.FIFFB_SSS_BASES          = 505;
FIFF.FIFFB_IAS                = 510;
%
% Of general interest
%
FIFF.FIFF_FILE_ID         = 100;
FIFF.FIFF_DIR_POINTER     = 101;
FIFF.FIFF_BLOCK_ID        = 103;
FIFF.FIFF_BLOCK_START     = 104;
FIFF.FIFF_BLOCK_END       = 105;
FIFF.FIFF_FREE_LIST       = 106;
FIFF.FIFF_FREE_BLOCK      = 107;
FIFF.FIFF_NOP             = 108;
FIFF.FIFF_PARENT_FILE_ID  = 109;
FIFF.FIFF_PARENT_BLOCK_ID = 110;
FIFF.FIFF_BLOCK_NAME      = 111;
FIFF.FIFF_BLOCK_VERSION   = 112;
FIFF.FIFF_CREATOR         = 113;  % Program that created the file (string)
FIFF.FIFF_MODIFIER        = 114;  % Program that modified the file (string)
FIFF.FIFF_REF_ROLE        = 115;
FIFF.FIFF_REF_FILE_ID     = 116;
FIFF.FIFF_REF_FILE_NUM    = 117;
FIFF.FIFF_REF_FILE_NAME   = 118;
%
%  Megacq saves the parameters in these tags
%
FIFF.FIFF_DACQ_PARS      = 150;
FIFF.FIFF_DACQ_STIM      = 151;

FIFF.FIFF_DEVICE_TYPE    = 152;
FIFF.FIFF_DEVICE_MODEL   = 153;
FIFF.FIFF_DEVICE_SERIAL  = 154;
FIFF.FIFF_DEVICE_SITE    = 155;

FIFF.FIFF_HE_LEVEL_RAW   = 156;
FIFF.FIFF_HELIUM_LEVEL   = 157;
FIFF.FIFF_ORIG_FILE_GUID = 158;
FIFF.FIFF_UTC_OFFSET     = 159;

FIFF.FIFF_NCHAN       = 200;
FIFF.FIFF_SFREQ       = 201;
FIFF.FIFF_DATA_PACK   = 202;
FIFF.FIFF_CH_INFO     = 203;
FIFF.FIFF_MEAS_DATE   = 204;
FIFF.FIFF_SUBJECT     = 205;
FIFF.FIFF_COMMENT     = 206;
FIFF.FIFF_NAVE        = 207;
FIFF.FIFF_FIRST_SAMPLE = 208;          % The first sample of an epoch
FIFF.FIFF_LAST_SAMPLE  = 209;          % The last sample of an epoch
FIFF.FIFF_ASPECT_KIND  = 210;
FIFF.FIFF_REF_EVENT    = 211;
FIFF.FIFF_EXPERIMENTER = 212;
FIFF.FIFF_DIG_POINT   = 213;
FIFF.FIFF_CH_POS      = 214;
FIFF.FIFF_HPI_SLOPES  = 215;           % HPI data
FIFF.FIFF_HPI_NCOIL   = 216;
FIFF.FIFF_REQ_EVENT   = 217;
FIFF.FIFF_REQ_LIMIT   = 218;
FIFF.FIFF_LOWPASS     = 219;
FIFF.FIFF_BAD_CHS       = 220;
FIFF.FIFF_ARTEF_REMOVAL = 221;
FIFF.FIFF_COORD_TRANS = 222;
FIFF.FIFF_HIGHPASS    = 223;
FIFF.FIFF_CH_CALS        = 224;     % This will not occur in new files
FIFF.FIFF_HPI_BAD_CHS    = 225;    % List of channels considered to be bad in hpi
FIFF.FIFF_HPI_CORR_COEFF = 226;    % HPI curve fit correlations
FIFF.FIFF_EVENT_COMMENT  = 227;    % Comment about the events used in averaging
FIFF.FIFF_NO_SAMPLES     = 228;    % Number of samples in an epoch
FIFF.FIFF_FIRST_TIME     = 229;    % Time scale minimum

FIFF.FIFF_SUBAVE_SIZE    = 230;    % Size of a subaverage
FIFF.FIFF_SUBAVE_FIRST   = 231;    % The first epoch % contained in the subaverage
FIFF.FIFF_NAME           = 233;          % Intended to be a short name.
FIFF.FIFF_DESCRIPTION    = FIFF.FIFF_COMMENT; % (Textual) Description of an object
FIFF.FIFF_DIG_STRING     = 234;          % String of digitized points
FIFF.FIFF_LINE_FREQ      = 235;    % Line frequency
FIFF.FIFF_GANTRY_ANGLE   = 282;    % Tilt angle of the gantry in degrees.

%
% HPI fitting program tags
%
FIFF.FIFF_HPI_COIL_FREQ          = 236;   % HPI coil excitation frequency
FIFF.FIFF_HPI_COIL_MOMENTS       = 240;   % Estimated moment vectors for the HPI coil magnetic dipoles
FIFF.FIFF_HPI_FIT_GOODNESS       = 241;   % Three floats indicating the goodness of fit
FIFF.FIFF_HPI_FIT_ACCEPT         = 242;   % Bitmask indicating acceptance (see below)
FIFF.FIFF_HPI_FIT_GOOD_LIMIT     = 243;   % Limit for the goodness-of-fit
FIFF.FIFF_HPI_FIT_DIST_LIMIT     = 244;   % Limit for the coil distance difference
FIFF.FIFF_HPI_COIL_NO            = 245;   % Coil number listed by HPI measurement
FIFF.FIFF_HPI_COILS_USED         = 246;   % List of coils finally used when the transformation was computed
FIFF.FIFF_HPI_DIGITIZATION_ORDER = 247;   % Which Isotrak digitization point corresponds to each of the coils energized
%
% Pointers
%
FIFF.FIFFV_NEXT_SEQ    = 0;
FIFF.FIFFV_NEXT_NONE   = -1;
%
% Channel types
%
FIFF.FIFFV_BIO_CH       = 102;
FIFF.FIFFV_MEG_CH       =   1;
FIFF.FIFFV_REF_MEG_CH   = 301;
FIFF.FIFFV_EEG_CH       =   2;
FIFF.FIFFV_MCG_CH       = 201;
FIFF.FIFFV_STIM_CH      =   3;
FIFF.FIFFV_EOG_CH       = 202;
FIFF.FIFFV_EMG_CH       = 302;
FIFF.FIFFV_ECG_CH       = 402;
FIFF.FIFFV_MISC_CH      = 502;
FIFF.FIFFV_RESP_CH      = 602;  % Respiration monitoring
FIFF.FIFFV_SEEG_CH      = 802;  % stereotactic EEG
FIFF.FIFFV_SYST_CH      = 900;  % some system status information (on Triux systems only)
FIFF.FIFFV_ECOG_CH      = 902;
FIFF.FIFFV_IAS_CH       = 910;  % Internal Active Shielding data (maybe on Triux only)
FIFF.FIFFV_EXCI_CH      = 920;  % flux excitation channel used to be a stimulus channel
FIFF.FIFFV_DIPOLE_WAVE  = 1000; % Dipole time curve (xplotter/xfit)
FIFF.FIFFV_GOODNESS_FIT = 1001;  % Goodness of fit (xplotter/xfit)
FIFF.FIFFV_FNIRS_CH     = 1100;  % Functional near-infrared spectroscopy

%
% Quaternion channels for head position monitoring
%
FIFF.FIFFV_QUAT_0   = 700;   % Quaternion param q0 obsolete for unit quaternion
FIFF.FIFFV_QUAT_1   = 701;   % Quaternion param q1 rotation
FIFF.FIFFV_QUAT_2   = 702;   % Quaternion param q2 rotation
FIFF.FIFFV_QUAT_3   = 703;   % Quaternion param q3 rotation
FIFF.FIFFV_QUAT_4   = 704;   % Quaternion param q4 translation
FIFF.FIFFV_QUAT_5   = 705;   % Quaternion param q5 translation
FIFF.FIFFV_QUAT_6   = 706;   % Quaternion param q6 translation
FIFF.FIFFV_HPI_G    = 707;   % Goodness-of-fit in continuous hpi
FIFF.FIFFV_HPI_ERR  = 708;   % Estimation error in continuous hpi
FIFF.FIFFV_HPI_MOV  = 709;   % Estimated head movement speed in continuous hpi
%
% Coordinate frames
%
FIFF.FIFFV_COORD_UNKNOWN        = 0;
FIFF.FIFFV_COORD_DEVICE         = 1;
FIFF.FIFFV_COORD_ISOTRAK        = 2;
FIFF.FIFFV_COORD_HPI            = 3;
FIFF.FIFFV_COORD_HEAD           = 4;
FIFF.FIFFV_COORD_MRI            = 5;
FIFF.FIFFV_COORD_MRI_SLICE      = 6;
FIFF.FIFFV_COORD_MRI_DISPLAY    = 7;
FIFF.FIFFV_COORD_DICOM_DEVICE   = 8;
FIFF.FIFFV_COORD_IMAGING_DEVICE = 9;
%
% Needed for raw and evoked-response data
%
FIFF.FIFF_DATA_BUFFER    = 300;    % Buffer containing measurement data
FIFF.FIFF_DATA_SKIP      = 301;    % Data skip in buffers
FIFF.FIFF_EPOCH          = 302;    % Buffer containing one epoch and channel
FIFF.FIFF_DATA_SKIP_SAMP = 303;    % Data skip in samples

%
% Info on subject
%
FIFF.FIFF_SUBJ_ID           = 400;  % Subject ID
FIFF.FIFF_SUBJ_FIRST_NAME   = 401;  % First name of the subject
FIFF.FIFF_SUBJ_MIDDLE_NAME  = 402;  % Middle name of the subject
FIFF.FIFF_SUBJ_LAST_NAME    = 403;  % Last name of the subject
FIFF.FIFF_SUBJ_BIRTH_DAY    = 404;  % Birthday of the subject
FIFF.FIFF_SUBJ_SEX          = 405;  % Sex of the subject
FIFF.FIFF_SUBJ_HAND         = 406;  % Handedness of the subject
FIFF.FIFF_SUBJ_WEIGHT       = 407;  % Weight of the subject in kg
FIFF.FIFF_SUBJ_HEIGHT       = 408;  % Height of the subject in m
FIFF.FIFF_SUBJ_COMMENT      = 409;  % Comment about the subject
FIFF.FIFF_SUBJ_HIS_ID       = 410;  % ID used in the Hospital Information System

FIFF.FIFFV_SUBJ_HAND_RIGHT  = 1;    % Righthanded
FIFF.FIFFV_SUBJ_HAND_LEFT   = 2;    % Lefthanded

FIFF.FIFFV_SUBJ_SEX_UNKNOWN = 0;    % Unknown gender
FIFF.FIFFV_SUBJ_SEX_MALE    = 1;    % Male
FIFF.FIFFV_SUBJ_SEX_FEMALE  = 2;    % Female

FIFF.FIFF_PROJ_ID           = 500;
FIFF.FIFF_PROJ_NAME         = 501;
FIFF.FIFF_PROJ_AIM          = 502;
FIFF.FIFF_PROJ_PERSONS      = 503;
FIFF.FIFF_PROJ_COMMENT      = 504;

FIFF.FIFF_EVENT_CHANNELS    = 600;  % Event channel numbers
FIFF.FIFF_EVENT_LIST        = 601;  % List of events (integers: <sample before after>
FIFF.FIFF_EVENT_CHANNEL     = 602;  % Event channel
FIFF.FIFF_EVENT_BITS        = 603;  % Event bits array

%
% Tags used in saving SQUID characteristics etc.
%
FIFF.FIFF_SQUID_BIAS        = 701;
FIFF.FIFF_SQUID_OFFSET      = 702;
FIFF.FIFF_SQUID_GATE        = 703;
%
% Aspect values used to save charactersitic curves of SQUIDs. (mjk)
%
FIFF.FIFFV_ASPECT_IFII_LOW  = 1100;
FIFF.FIFFV_ASPECT_IFII_HIGH = 1101;
FIFF.FIFFV_ASPECT_GATE      = 1102;

%
% Values for file references
%
FIFF.FIFFV_ROLE_PREV_FILE = 1;
FIFF.FIFFV_ROLE_NEXT_FILE = 2;

%
% References
%
FIFF.FIFF_REF_PATH           = 1101;

%
% Different aspects of data
%
FIFF.FIFFV_ASPECT_AVERAGE       = 100;  % Normal average of epochs
FIFF.FIFFV_ASPECT_STD_ERR       = 101;  % Std. error of mean
FIFF.FIFFV_ASPECT_SINGLE        = 102;  % Single epoch cut out from the continuous data
FIFF.FIFFV_ASPECT_SUBAVERAGE    = 103;  % Partial average (subaverage)
FIFF.FIFFV_ASPECT_ALTAVERAGE    = 104;  % Alternating subaverage
FIFF.FIFFV_ASPECT_SAMPLE        = 105;  % A sample cut out by graph
FIFF.FIFFV_ASPECT_POWER_DENSITY = 106;  % Power density spectrum
FIFF.FIFFV_ASPECT_DIPOLE_WAVE   = 200;  % Dipole amplitude curve

%
% BEM surface IDs
%
FIFF.FIFFV_BEM_SURF_ID_UNKNOWN    = -1;
FIFF.FIFFV_BEM_SURF_ID_NOT_KNOWN  = 0;
FIFF.FIFFV_BEM_SURF_ID_BRAIN      = 1;
FIFF.FIFFV_BEM_SURF_ID_CSF        = 2;
FIFF.FIFFV_BEM_SURF_ID_SKULL      = 3;
FIFF.FIFFV_BEM_SURF_ID_HEAD       = 4;

FIFF.FIFF_SPHERE_ORIGIN          = 3001;
FIFF.FIFF_SPHERE_RADIUS          = 3002;

FIFF.FIFF_BEM_SURF_ID           = 3101;  % int    surface number
FIFF.FIFF_BEM_SURF_NAME         = 3102;  % string surface name
FIFF.FIFF_BEM_SURF_NNODE        = 3103;  % int    number of nodes on a surface
FIFF.FIFF_BEM_SURF_NTRI         = 3104;  % int     number of triangles on a surface
FIFF.FIFF_BEM_SURF_NODES        = 3105;  % float  surface nodes (nnode,3)
FIFF.FIFF_BEM_SURF_TRIANGLES    = 3106;  % int    surface triangles (ntri,3)
FIFF.FIFF_BEM_SURF_NORMALS      = 3107;  % float  surface node normal unit vectors

FIFF.FIFF_BEM_POT_SOLUTION      = 3110;  % float ** The solution matrix
FIFF.FIFF_BEM_APPROX            = 3111;  % int    approximation method, see below
FIFF.FIFF_BEM_COORD_FRAME       = 3112;  % The coordinate frame of the model
FIFF.FIFF_BEM_SIGMA             = 3113;  % Conductivity of a compartment
FIFF.FIFFV_BEM_APPROX_CONST     = 1;     % The constant potential approach
FIFF.FIFFV_BEM_APPROX_LINEAR    = 2;     % The linear potential approach

%
% More of those defined in MNE
%
FIFF.FIFFV_MNE_SURF_UNKNOWN       = -1;
FIFF.FIFFV_MNE_SURF_LEFT_HEMI     = 101;
FIFF.FIFFV_MNE_SURF_RIGHT_HEMI    = 102;
FIFF.FIFFV_MNE_SURF_MEG_HELMET    = 201;               % Use this irrespective of the system
%
%   These relate to the Isotrak data (enum(point))
%
FIFF.FIFFV_POINT_CARDINAL = 1;
FIFF.FIFFV_POINT_HPI      = 2;
FIFF.FIFFV_POINT_EEG      = 3;
FIFF.FIFFV_POINT_ECG      = FIFF.FIFFV_POINT_EEG;
FIFF.FIFFV_POINT_EXTRA    = 4;
FIFF.FIFFV_POINT_HEAD     = 5;  % Point on the surface of the head
%
% Cardinal point types (enum(cardinal_point))
%
FIFF.FIFFV_POINT_LPA = 1;
FIFF.FIFFV_POINT_NASION = 2;
FIFF.FIFFV_POINT_RPA = 3;
FIFF.FIFFV_POINT_INION = 4;
%
%   SSP
%
FIFF.FIFF_PROJ_ITEM_KIND         = 3411;
FIFF.FIFF_PROJ_ITEM_TIME         = 3412;
FIFF.FIFF_PROJ_ITEM_NVEC         = 3414;
FIFF.FIFF_PROJ_ITEM_VECTORS      = 3415;
FIFF.FIFF_PROJ_ITEM_DEFINITION   = 3416;
FIFF.FIFF_PROJ_ITEM_CH_NAME_LIST = 3417;
%   XPlotter
FIFF.FIFF_XPLOTTER_LAYOUT        = 3501;  % string - "Xplotter layout tag"
%
%   MRIs
%
FIFF.FIFF_MRI_SOURCE_PATH       = FIFF.FIFF_REF_PATH;
FIFF.FIFF_MRI_SOURCE_FORMAT     = 2002;
FIFF.FIFF_MRI_PIXEL_ENCODING    = 2003;
FIFF.FIFF_MRI_PIXEL_DATA_OFFSET = 2004;
FIFF.FIFF_MRI_PIXEL_SCALE       = 2005;
FIFF.FIFF_MRI_PIXEL_DATA        = 2006;
FIFF.FIFF_MRI_PIXEL_OVERLAY_ENCODING = 2007;
FIFF.FIFF_MRI_PIXEL_OVERLAY_DATA     = 2008;
FIFF.FIFF_MRI_BOUNDING_BOX           = 2009;
FIFF.FIFF_MRI_WIDTH             = 2010;
FIFF.FIFF_MRI_WIDTH_M           = 2011;
FIFF.FIFF_MRI_HEIGHT            = 2012;
FIFF.FIFF_MRI_HEIGHT_M          = 2013;
FIFF.FIFF_MRI_DEPTH             = 2014;
FIFF.FIFF_MRI_DEPTH_M           = 2015;
FIFF.FIFF_MRI_THICKNESS         = 2016;
FIFF.FIFF_MRI_SCENE_AIM         = 2017;
FIFF.FIFF_MRI_ORIG_SOURCE_PATH       = 2020;
FIFF.FIFF_MRI_ORIG_SOURCE_FORMAT     = 2021;
FIFF.FIFF_MRI_ORIG_PIXEL_ENCODING    = 2022;
FIFF.FIFF_MRI_ORIG_PIXEL_DATA_OFFSET = 2023;
FIFF.FIFF_MRI_VOXEL_DATA             = 2030;
FIFF.FIFF_MRI_VOXEL_ENCODING         = 2031;
FIFF.FIFF_MRI_MRILAB_SETUP           = 2100;
FIFF.FIFF_MRI_SEG_REGION_ID          = 2200;
%
FIFF.FIFFV_MRI_PIXEL_UNKNOWN    = 0;
FIFF.FIFFV_MRI_PIXEL_BYTE       = 1;
FIFF.FIFFV_MRI_PIXEL_WORD       = 2;
FIFF.FIFFV_MRI_PIXEL_SWAP_WORD  = 3;
FIFF.FIFFV_MRI_PIXEL_FLOAT      = 4;
FIFF.FIFFV_MRI_PIXEL_BYTE_INDEXED_COLOR = 5;
FIFF.FIFFV_MRI_PIXEL_BYTE_RGB_COLOR     = 6;
FIFF.FIFFV_MRI_PIXEL_BYTE_RLE_RGB_COLOR = 7;
FIFF.FIFFV_MRI_PIXEL_BIT_RLE            = 8;
%
%   These are the MNE fiff definitions (range 350-390 reserved for MNE)
%
FIFF.FIFFB_MNE                    = 350;
FIFF.FIFFB_MNE_SOURCE_SPACE       = 351;
FIFF.FIFFB_MNE_FORWARD_SOLUTION   = 352;
FIFF.FIFFB_MNE_PARENT_MRI_FILE    = 353;
FIFF.FIFFB_MNE_PARENT_MEAS_FILE   = 354;
FIFF.FIFFB_MNE_COV                = 355;
FIFF.FIFFB_MNE_INVERSE_SOLUTION   = 356;
FIFF.FIFFB_MNE_NAMED_MATRIX       = 357;
FIFF.FIFFB_MNE_ENV                = 358;
FIFF.FIFFB_MNE_BAD_CHANNELS       = 359;
FIFF.FIFFB_MNE_VERTEX_MAP         = 360;
FIFF.FIFFB_MNE_EVENTS             = 361;
FIFF.FIFFB_MNE_MORPH_MAP          = 362;
FIFF.FIFFB_MNE_SURFACE_MAP        = 363;
FIFF.FIFFB_MNE_SURFACE_MAP_GROUP  = 364;

%
% CTF compensation data
%
FIFF.FIFFB_MNE_CTF_COMP           = 370;
FIFF.FIFFB_MNE_CTF_COMP_DATA      = 371;
FIFF.FIFFB_MNE_DERIVATIONS        = 372;

FIFF.FIFFB_MNE_EPOCHS             = 373;
FIFF.FIFFB_MNE_ICA                = 374;
%
% Fiff tags associated with MNE computations (3500...)
%
%
% 3500... Bookkeeping
%
FIFF.FIFF_MNE_ROW_NAMES              = 3502;
FIFF.FIFF_MNE_COL_NAMES              = 3503;
FIFF.FIFF_MNE_NROW                   = 3504;
FIFF.FIFF_MNE_NCOL                   = 3505;
FIFF.FIFF_MNE_COORD_FRAME            = 3506;  % Coordinate frame employed. Defaults:
%  FIFFB_MNE_SOURCE_SPACE       FIFFV_COORD_MRI
%  FIFFB_MNE_FORWARD_SOLUTION   FIFFV_COORD_HEAD
%  FIFFB_MNE_INVERSE_SOLUTION   FIFFV_COORD_HEAD
FIFF.FIFF_MNE_CH_NAME_LIST           = 3507;
FIFF.FIFF_MNE_FILE_NAME              = 3508;  % This removes the collision with fiff_file.h (used to be 3501)
%
% 3510... 3590... Source space or surface
%
FIFF.FIFF_MNE_SOURCE_SPACE_POINTS        = 3510;  % The vertices
FIFF.FIFF_MNE_SOURCE_SPACE_NORMALS       = 3511;  % The vertex normals
FIFF.FIFF_MNE_SOURCE_SPACE_NPOINTS       = 3512;  % How many vertices
FIFF.FIFF_MNE_SOURCE_SPACE_SELECTION     = 3513;  % Which are selected to the source space
FIFF.FIFF_MNE_SOURCE_SPACE_NUSE          = 3514;  % How many are in use
FIFF.FIFF_MNE_SOURCE_SPACE_NEAREST       = 3515;  % Nearest source space vertex for all vertices
FIFF.FIFF_MNE_SOURCE_SPACE_NEAREST_DIST  = 3516;  % Distance to the Nearest source space vertex for all vertices
FIFF.FIFF_MNE_SOURCE_SPACE_ID            = 3517;  % Identifier
FIFF.FIFF_MNE_SOURCE_SPACE_TYPE          = 3518;  % Surface or volume
FIFF.FIFF_MNE_SOURCE_SPACE_VERTICES      = 3519;  % List of vertices (zero based)

FIFF.FIFF_MNE_SOURCE_SPACE_VOXEL_DIMS    = 3596;  % Voxel space dimensions in a volume source space
FIFF.FIFF_MNE_SOURCE_SPACE_INTERPOLATOR  = 3597;  % Matrix to interpolate a volume source space into a mri volume
FIFF.FIFF_MNE_SOURCE_SPACE_MRI_FILE      = 3598;  % MRI file used in the interpolation

FIFF.FIFF_MNE_SOURCE_SPACE_NTRI          = 3590;  % Number of triangles
FIFF.FIFF_MNE_SOURCE_SPACE_TRIANGLES     = 3591;  % The triangulation
FIFF.FIFF_MNE_SOURCE_SPACE_NUSE_TRI      = 3592;  % Number of triangles corresponding to the number of vertices in use
FIFF.FIFF_MNE_SOURCE_SPACE_USE_TRIANGLES = 3593;  % The triangulation of the used vertices in the source space
FIFF.FIFF_MNE_SOURCE_SPACE_NNEIGHBORS    = 3594;  % Number of neighbors for each source space point (used for volume source spaces)
FIFF.FIFF_MNE_SOURCE_SPACE_NEIGHBORS     = 3595;  % Neighbors for each source space point (used for volume source spaces)

FIFF.FIFF_MNE_SOURCE_SPACE_DIST          = 3599;  % Distances between vertices in use (along the surface)
FIFF.FIFF_MNE_SOURCE_SPACE_DIST_LIMIT    = 3600;  % If distance is above this limit (in the volume) it has not been calculated

FIFF.FIFF_MNE_SURFACE_MAP_DATA           = 3610;  % Surface map data
FIFF.FIFF_MNE_SURFACE_MAP_KIND           = 3611;  % Type of map

%
% 3520... Forward solution
%
FIFF.FIFF_MNE_FORWARD_SOLUTION       = 3520;
FIFF.FIFF_MNE_SOURCE_ORIENTATION     = 3521;  % Fixed or free
FIFF.FIFF_MNE_INCLUDED_METHODS       = 3522;
FIFF.FIFF_MNE_FORWARD_SOLUTION_GRAD  = 3523;
%
% 3530... Covariance matrix
%
FIFF.FIFF_MNE_COV_KIND               = 3530;  % What kind of a covariance matrix
FIFF.FIFF_MNE_COV_DIM                = 3531;  % Matrix dimension
FIFF.FIFF_MNE_COV                    = 3532;  % Full matrix in packed representation (lower triangle)
FIFF.FIFF_MNE_COV_DIAG               = 3533;  % Diagonal matrix
FIFF.FIFF_MNE_COV_EIGENVALUES        = 3534;  % Eigenvalues and eigenvectors of the above
FIFF.FIFF_MNE_COV_EIGENVECTORS       = 3535;
FIFF.FIFF_MNE_COV_NFREE              = 3536;  % Number of degrees of freedom
FIFF.FIFF_MNE_COV_METHOD             = 3537;  % The estimator used
FIFF.FIFF_MNE_COV_SCORE              = 3538;  % Negative log-likelihood

%
% 3540... Inverse operator
%
% We store the inverse operator as the eigenleads, eigenfields,
% and weights
%
FIFF.FIFF_MNE_INVERSE_LEADS              = 3540;   % The eigenleads
FIFF.FIFF_MNE_INVERSE_LEADS_WEIGHTED     = 3546;   % The eigenleads (already weighted with R^0.5)
FIFF.FIFF_MNE_INVERSE_FIELDS             = 3541;   % The eigenfields
FIFF.FIFF_MNE_INVERSE_SING               = 3542;   % The singular values
FIFF.FIFF_MNE_PRIORS_USED                = 3543;   % Which kind of priors have been used for the source covariance matrix
FIFF.FIFF_MNE_INVERSE_FULL               = 3544;   % Inverse operator as one matrix
                           % This matrix includes the whitening operator as well
                           % The regularization is applied
FIFF.FIFF_MNE_INVERSE_SOURCE_ORIENTATIONS = 3545;  % Contains the orientation of one source per row
                           % The source orientations must be expressed in the coordinate system
                           % given by FIFF_MNE_COORD_FRAME
FIFF.FIFF_MNE_INVERSE_SOURCE_UNIT         = 3547;  % Are the sources given in Am or Am/m^2 ?
%
% 3550... Saved environment info
%
FIFF.FIFF_MNE_ENV_WORKING_DIR        = 3550;     % Working directory where the file was created
FIFF.FIFF_MNE_ENV_COMMAND_LINE       = 3551;     % The command used to create the file
FIFF.FIFF_MNE_EXTERNAL_BIG_ENDIAN    = 3552;     % Reference to an external binary file (big-endian) */
FIFF.FIFF_MNE_EXTERNAL_LITTLE_ENDIAN = 3553;     % Reference to an external binary file (little-endian) */
%
% 3560... Miscellaneous
%
FIFF.FIFF_MNE_PROJ_ITEM_ACTIVE       = 3560;     % Is this projection item active?
FIFF.FIFF_MNE_EVENT_LIST             = 3561;     % An event list (for STI101 / STI 014)
FIFF.FIFF_MNE_HEMI                   = 3562;     % Hemisphere association for general purposes
FIFF.FIFF_MNE_DATA_SKIP_NOP          = 3563;     % A data skip turned off in the raw data
FIFF.FIFF_MNE_ORIG_CH_INFO           = 3564;     % Channel information before any changes
FIFF.FIFF_MNE_EVENT_TRIGGER_MASK     = 3565;     % Mask applied to the trigger channel values
FIFF.FIFF_MNE_EVENT_COMMENTS         = 3566;     % Event comments merged into one long string
FIFF.FIFF_MNE_CUSTOM_REF             = 3567;     % Whether a custom reference was applied to the data
FIFF.FIFF_MNE_BASELINE_MIN           = 3568;     % Time of baseline beginning
FIFF.FIFF_MNE_BASELINE_MAX           = 3569;     % Time of baseline end
%
% 3570... Morphing maps
%
FIFF.FIFF_MNE_MORPH_MAP              = 3570;     % Mapping of closest vertices on the sphere
FIFF.FIFF_MNE_MORPH_MAP_FROM         = 3571;     % Which subject is this map from
FIFF.FIFF_MNE_MORPH_MAP_TO           = 3572;     % Which subject is this map to
%
% 3580... CTF compensation data
%
FIFF.FIFF_MNE_CTF_COMP_KIND         = 3580;     % What kind of compensation
FIFF.FIFF_MNE_CTF_COMP_DATA         = 3581;     % The compensation data itself
FIFF.FIFF_MNE_CTF_COMP_CALIBRATED   = 3582;     % Are the coefficients calibrated?

FIFF.FIFF_MNE_DERIVATION_DATA       = 3585;     % Used to store information about EEG and other derivations
%
% 3601... values associated with ICA decomposition
%
FIFF.FIFF_MNE_ICA_INTERFACE_PARAMS  = 3601;     % ICA interface parameters
FIFF.FIFF_MNE_ICA_CHANNEL_NAMES     = 3602;     % ICA channel names
FIFF.FIFF_MNE_ICA_WHITENER          = 3603;     % ICA whitener
FIFF.FIFF_MNE_ICA_PCA_COMPONENTS    = 3604;     % PCA components
FIFF.FIFF_MNE_ICA_PCA_EXPLAINED_VAR = 3605;     % PCA explained variance
FIFF.FIFF_MNE_ICA_PCA_MEAN          = 3606;     % PCA mean
FIFF.FIFF_MNE_ICA_MATRIX            = 3607;     % ICA unmixing matrix
FIFF.FIFF_MNE_ICA_BADS              = 3608;     % ICA bad sources
FIFF.FIFF_MNE_ICA_MISC_PARAMS       = 3609;     % ICA misc params
%
% Miscellaneous
%
FIFF.FIFF_MNE_KIT_SYSTEM_ID         = 3612;     % Unique ID assigned to KIT systems
%
% Maxfilter tags
%
FIFF.FIFF_SSS_FRAME                 = 263;
FIFF.FIFF_SSS_JOB                   = 264;
FIFF.FIFF_SSS_ORIGIN                = 265;
FIFF.FIFF_SSS_ORD_IN                = 266;
FIFF.FIFF_SSS_ORD_OUT               = 267;
FIFF.FIFF_SSS_NMAG                  = 268;
FIFF.FIFF_SSS_COMPONENTS            = 269;
FIFF.FIFF_SSS_CAL_CHANS             = 270;
FIFF.FIFF_SSS_CAL_CORRS             = 271;
FIFF.FIFF_SSS_ST_CORR               = 272;
FIFF.FIFF_SSS_NFREE                 = 278;
FIFF.FIFF_SSS_ST_LENGTH             = 279;
FIFF.FIFF_DECOUPLER_MATRIX          = 800;
%
% Fiff values associated with MNE computations
%
FIFF.FIFFV_MNE_UNKNOWN_ORI          = 0;
FIFF.FIFFV_MNE_FIXED_ORI            = 1;
FIFF.FIFFV_MNE_FREE_ORI             = 2;

FIFF.FIFFV_MNE_MEG                  = 1;
FIFF.FIFFV_MNE_EEG                  = 2;
FIFF.FIFFV_MNE_MEG_EEG              = 3;

FIFF.FIFFV_MNE_PRIORS_NONE          = 0;
FIFF.FIFFV_MNE_PRIORS_DEPTH         = 1;
FIFF.FIFFV_MNE_PRIORS_LORETA        = 2;
FIFF.FIFFV_MNE_PRIORS_SULCI         = 3;

FIFF.FIFFV_MNE_UNKNOWN_COV          = 0;
FIFF.FIFFV_MNE_SENSOR_COV           = 1;
FIFF.FIFFV_MNE_NOISE_COV            = 1;         % This is what it should have been called
FIFF.FIFFV_MNE_SOURCE_COV           = 2;
FIFF.FIFFV_MNE_FMRI_PRIOR_COV       = 3;
FIFF.FIFFV_MNE_SIGNAL_COV           = 4;         % This will be potentially employed in beamformers
FIFF.FIFFV_MNE_DEPTH_PRIOR_COV      = 5;         % The depth weighting prior
FIFF.FIFFV_MNE_ORIENT_PRIOR_COV     = 6;         % The orientation prior

%
% Output map types
%
FIFF.FIFFV_MNE_MAP_UNKNOWN                   = -1;     % Unspecified
FIFF.FIFFV_MNE_MAP_SCALAR_CURRENT            =  1;     % Scalar current value
FIFF.FIFFV_MNE_MAP_SCALAR_CURRENT_SIZE       =  2;     % Absolute value of the above
FIFF.FIFFV_MNE_MAP_VECTOR_CURRENT            =  3;     % Current vector components
FIFF.FIFFV_MNE_MAP_VECTOR_CURRENT_SIZE       =  4;     % Vector current size
FIFF.FIFFV_MNE_MAP_T_STAT                    =  5;     % Student's t statistic
FIFF.FIFFV_MNE_MAP_F_STAT                    =  6;     % F statistic
FIFF.FIFFV_MNE_MAP_F_STAT_SQRT               =  7;     % Square root of the F statistic
FIFF.FIFFV_MNE_MAP_CHI2_STAT                 =  8;     % (Approximate) chi^2 statistic
FIFF.FIFFV_MNE_MAP_CHI2_STAT_SQRT            =  9;     % Square root of the (approximate) chi^2 statistic
FIFF.FIFFV_MNE_MAP_SCALAR_CURRENT_NOISE      = 10;     % Current noise approximation (scalar)
FIFF.FIFFV_MNE_MAP_VECTOR_CURRENT_NOISE      = 11;     % Current noise approximation (vector)
%
% Source space types (values of FIFF_MNE_SOURCE_SPACE_TYPE)
%
FIFF.FIFFV_MNE_SPACE_UNKNOWN  = -1;
FIFF.FIFFV_MNE_SPACE_SURFACE  = 1;
FIFF.FIFFV_MNE_SPACE_VOLUME   = 2;
FIFF.FIFFV_MNE_SPACE_DISCRETE = 3;
%
% Covariance matrix channel classification
%
FIFF.FIFFV_MNE_COV_CH_UNKNOWN  = -1;  % No idea
FIFF.FIFFV_MNE_COV_CH_MEG_MAG  =  0;  % Axial gradiometer or magnetometer [T]
FIFF.FIFFV_MNE_COV_CH_MEG_GRAD =  1;  % Planar gradiometer [T/m]
FIFF.FIFFV_MNE_COV_CH_EEG      =  2;  % EEG [V]
%
% Projection item kinds
%
FIFF.FIFFV_PROJ_ITEM_NONE           = 0;
FIFF.FIFFV_PROJ_ITEM_FIELD          = 1;
FIFF.FIFFV_PROJ_ITEM_DIP_FIX        = 2;
FIFF.FIFFV_PROJ_ITEM_DIP_ROT        = 3;
FIFF.FIFFV_PROJ_ITEM_HOMOG_GRAD     = 4;
FIFF.FIFFV_PROJ_ITEM_HOMOG_FIELD    = 5;
FIFF.FIFFV_PROJ_ITEM_EEG_AVREF      = 10;  % Linear projection related to EEG average reference
FIFF.FIFFV_MNE_PROJ_ITEM_EEG_AVREF  = FIFF.FIFFV_PROJ_ITEM_EEG_AVREF;  % backward compat alias
%
% SSS job options
%
FIFF.FIFFV_SSS_JOB_NOTHING          = 0;   % No SSS, just copy input to output
FIFF.FIFFV_SSS_JOB_CTC              = 1;   % No SSS, only cross-talk correction
FIFF.FIFFV_SSS_JOB_FILTER           = 2;   % Spatial maxwell filtering
FIFF.FIFFV_SSS_JOB_VIRT             = 3;   % Transform data to another sensor array
FIFF.FIFFV_SSS_JOB_HEAD_POS         = 4;   % Estimate head positions, no SSS
FIFF.FIFFV_SSS_JOB_MOVEC_FIT        = 5;   % Estimate and compensate head movement
FIFF.FIFFV_SSS_JOB_MOVEC_QUA        = 6;   % Compensate head movement from previously estimated head positions
FIFF.FIFFV_SSS_JOB_REC_ALL          = 7;   % Reconstruct inside and outside signals
FIFF.FIFFV_SSS_JOB_REC_IN           = 8;   % Reconstruct inside signals
FIFF.FIFFV_SSS_JOB_REC_OUT          = 9;   % Reconstruct outside signals
FIFF.FIFFV_SSS_JOB_ST               = 10;  % Spatio-temporal maxwell filtering
FIFF.FIFFV_SSS_JOB_TPROJ            = 11;  % Temporal projection, no SSS
FIFF.FIFFV_SSS_JOB_XSSS             = 12;  % Cross-validation SSS
FIFF.FIFFV_SSS_JOB_XSUB             = 13;  % Cross-validation subtraction, no SSS
FIFF.FIFFV_SSS_JOB_XWAV             = 14;  % Cross-validation noise waveforms
FIFF.FIFFV_SSS_JOB_NCOV             = 15;  % Noise covariance estimation
FIFF.FIFFV_SSS_JOB_SCOV             = 16;  % SSS sample covariance estimation
%}

%
% Additional coordinate frames
%
FIFF.FIFFV_MNE_COORD_TUFTS_EEG   =  300;         % For Tufts EEG data
FIFF.FIFFV_MNE_COORD_CTF_DEVICE  = 1001;         % CTF device coordinates
FIFF.FIFFV_MNE_COORD_CTF_HEAD    = 1004;         % CTF head coordinates
FIFF.FIFFV_MNE_COORD_DIGITIZER   = FIFF.FIFFV_COORD_ISOTRAK; % Original (Polhemus) digitizer coordinates
FIFF.FIFFV_MNE_COORD_SURFACE_RAS = FIFF.FIFFV_COORD_MRI;     % The surface RAS coordinates
FIFF.FIFFV_MNE_COORD_MRI_VOXEL   = 2001;         % The MRI voxel coordinates
FIFF.FIFFV_MNE_COORD_RAS         = 2002;         % Surface RAS coordinates with non-zero origin
FIFF.FIFFV_MNE_COORD_MNI_TAL     = 2003;         % MNI Talairach coordinates
FIFF.FIFFV_MNE_COORD_FS_TAL_GTZ  = 2004;         % FreeSurfer Talairach coordinates (MNI z > 0)
FIFF.FIFFV_MNE_COORD_FS_TAL_LTZ  = 2005;         % FreeSurfer Talairach coordinates (MNI z < 0)
FIFF.FIFFV_MNE_COORD_FS_TAL      = 2006;         % FreeSurfer Talairach coordinates
%
% 4D and KIT use the same head coordinate system definition as CTF
%
FIFF.FIFFV_MNE_COORD_4D_HEAD     = FIFF.FIFFV_MNE_COORD_CTF_HEAD;
FIFF.FIFFV_MNE_COORD_KIT_HEAD    = FIFF.FIFFV_MNE_COORD_CTF_HEAD;

%
%   FWD Types
%

FWD.COIL_UNKNOWN                 = 0;
FWD.COILC_UNKNOWN                = 0;
FWD.COILC_EEG                    = 1000;
FWD.COILC_MAG                    = 1;
FWD.COILC_AXIAL_GRAD             = 2;
FWD.COILC_PLANAR_GRAD            = 3;
FWD.COILC_AXIAL_GRAD2            = 4;

FWD.COIL_ACCURACY_POINT          = 0;
FWD.COIL_ACCURACY_NORMAL         = 1;
FWD.COIL_ACCURACY_ACCURATE       = 2;

FWD.BEM_UNKNOWN                  = -1;
FWD.BEM_CONSTANT_COLL            = 1;
FWD.BEM_LINEAR_COLL              = 2;

FWD.BEM_IP_APPROACH_LIMIT        = 0.1;

FWD.BEM_LIN_FIELD_SIMPLE         = 1;
FWD.BEM_LIN_FIELD_FERGUSON       = 2;
FWD.BEM_LIN_FIELD_URANKAR        = 3;

%
%   Data types
%
FIFF.FIFFT_VOID                  = 0;
FIFF.FIFFT_BYTE                  = 1;
FIFF.FIFFT_SHORT                 = 2;
FIFF.FIFFT_INT                   = 3;
FIFF.FIFFT_FLOAT                 = 4;
FIFF.FIFFT_DOUBLE                = 5;
FIFF.FIFFT_JULIAN                = 6;
FIFF.FIFFT_USHORT                = 7;
FIFF.FIFFT_UINT                  = 8;
FIFF.FIFFT_ULONG                 = 9;
FIFF.FIFFT_STRING                = 10;
FIFF.FIFFT_LONG                  = 11;
FIFF.FIFFT_DAU_PACK13            = 13;
FIFF.FIFFT_DAU_PACK14            = 14;
FIFF.FIFFT_DAU_PACK16            = 16;
FIFF.FIFFT_COMPLEX_FLOAT         = 20;
FIFF.FIFFT_COMPLEX_DOUBLE        = 21;
FIFF.FIFFT_OLD_PACK              = 23;
FIFF.FIFFT_CH_INFO_STRUCT        = 30;
FIFF.FIFFT_ID_STRUCT             = 31;
FIFF.FIFFT_DIR_ENTRY_STRUCT      = 32;
FIFF.FIFFT_DIG_POINT_STRUCT      = 33;
FIFF.FIFFT_CH_POS_STRUCT         = 34;
FIFF.FIFFT_COORD_TRANS_STRUCT    = 35;
FIFF.FIFFT_DIG_STRING_STRUCT     = 36;
FIFF.FIFFT_STREAM_SEGMENT_STRUCT = 37;
%
% Units of measurement
%
FIFF.FIFF_UNIT_NONE = -1;
%
% SI base units
%
FIFF.FIFF_UNIT_UNITLESS = 0;
FIFF.FIFF_UNIT_M   = 1;  % meter
FIFF.FIFF_UNIT_KG  = 2;  % kilogram
FIFF.FIFF_UNIT_SEC = 3;  % second
FIFF.FIFF_UNIT_A   = 4;  % ampere
FIFF.FIFF_UNIT_K   = 5;  % Kelvin
FIFF.FIFF_UNIT_MOL = 6;  % mole
%
% SI Supplementary units
%
FIFF.FIFF_UNIT_RAD = 7;  % radian
FIFF.FIFF_UNIT_SR  = 8;  % steradian
%
% SI base candela
%
FIFF.FIFF_UNIT_CD  = 9;  % candela
%
% SI derived units
%
FIFF.FIFF_UNIT_MOL_M3 = 10;  % mol/m^3
FIFF.FIFF_UNIT_HZ  = 101;  % hertz
FIFF.FIFF_UNIT_N   = 102;  % Newton
FIFF.FIFF_UNIT_PA  = 103;  % pascal
FIFF.FIFF_UNIT_J   = 104;  % joule
FIFF.FIFF_UNIT_W   = 105;  % watt
FIFF.FIFF_UNIT_C   = 106;  % coulomb
FIFF.FIFF_UNIT_V   = 107;  % volt
FIFF.FIFF_UNIT_F   = 108;  % farad
FIFF.FIFF_UNIT_OHM = 109;  % ohm
FIFF.FIFF_UNIT_MHO = 110;  % one per ohm
FIFF.FIFF_UNIT_WB  = 111;  % weber
FIFF.FIFF_UNIT_T   = 112;  % tesla
FIFF.FIFF_UNIT_H   = 113;  % Henry
FIFF.FIFF_UNIT_CEL = 114;  % celsius
FIFF.FIFF_UNIT_LM  = 115;  % lumen
FIFF.FIFF_UNIT_LX  = 116;  % lux
%
% Others we need
%
FIFF.FIFF_UNIT_T_M   = 201;  % T/m
FIFF.FIFF_UNIT_AM    = 202;  % Am
FIFF.FIFF_UNIT_AM_M2 = 203;  % Am/m^2
FIFF.FIFF_UNIT_AM_M3 = 204;  % Am/m^3
%
% Multipliers
%
FIFF.FIFF_UNITM_E    = 18;
FIFF.FIFF_UNITM_PET  = 15;
FIFF.FIFF_UNITM_T    = 12;
FIFF.FIFF_UNITM_GIG  = 9;
FIFF.FIFF_UNITM_MEG  = 6;
FIFF.FIFF_UNITM_K    = 3;
FIFF.FIFF_UNITM_H    = 2;
FIFF.FIFF_UNITM_DA   = 1;
FIFF.FIFF_UNITM_NONE = 0;
FIFF.FIFF_UNITM_D    = -1;
FIFF.FIFF_UNITM_C    = -2;
FIFF.FIFF_UNITM_M    = -3;
FIFF.FIFF_UNITM_MU   = -6;
FIFF.FIFF_UNITM_N    = -9;
FIFF.FIFF_UNITM_P    = -12;
FIFF.FIFF_UNITM_F    = -15;
FIFF.FIFF_UNITM_A    = -18;

%
% Coil types
%
FIFF.FIFFV_COIL_NONE                  = 0;  % The location info contains no data
FIFF.FIFFV_COIL_EEG                   = 1;  % EEG electrode position in r0
FIFF.FIFFV_COIL_NM_122                = 2;  % Neuromag 122 coils
FIFF.FIFFV_COIL_NM_24                 = 3;  % Old 24 channel system in HUT
FIFF.FIFFV_COIL_NM_MCG_AXIAL          = 4;  % The axial devices in the HUCS MCG system
FIFF.FIFFV_COIL_EEG_BIPOLAR           = 5;  % Bipolar EEG lead

FIFF.FIFFV_COIL_DIPOLE             = 200;  % Time-varying dipole definition
% The coil info contains dipole location (r0) and
% direction (ex)
FIFF.FIFFV_COIL_FNIRS_HBO             = 300;  % fNIRS oxyhemoglobin
FIFF.FIFFV_COIL_FNIRS_HBR             = 301;  % fNIRS deoxyhemoglobin
FIFF.FIFFV_COIL_FNIRS_RAW             = 302;  % fNIRS raw light intensity
FIFF.FIFFV_COIL_FNIRS_OD              = 303;  % fNIRS optical density

FIFF.FIFFV_COIL_MCG_42             = 1000;  % For testing the MCG software

FIFF.FIFFV_COIL_POINT_MAGNETOMETER   = 2000;  % Simple point magnetometer
FIFF.FIFFV_COIL_AXIAL_GRAD_5CM       = 2001;  % Generic axial gradiometer

FIFF.FIFFV_COIL_VV_PLANAR_W        = 3011;  % VV prototype wirewound planar sensor
FIFF.FIFFV_COIL_VV_PLANAR_T1       = 3012;  % Vectorview SQ20483N planar gradiometer
FIFF.FIFFV_COIL_VV_PLANAR_T2       = 3013;  % Vectorview SQ20483N-A planar gradiometer
FIFF.FIFFV_COIL_VV_PLANAR_T3       = 3014;  % Vectorview SQ20950N planar gradiometer
FIFF.FIFFV_COIL_VV_PLANAR_T4       = 3015;  % Vectorview planar gradiometer (MEG-MRI)
FIFF.FIFFV_COIL_VV_MAG_W           = 3021;  % VV prototype wirewound magnetometer
FIFF.FIFFV_COIL_VV_MAG_T1          = 3022;  % Vectorview SQ20483N magnetometer
FIFF.FIFFV_COIL_VV_MAG_T2          = 3023;  % Vectorview SQ20483-A magnetometer
FIFF.FIFFV_COIL_VV_MAG_T3          = 3024;  % Vectorview SQ20950N magnetometer
FIFF.FIFFV_COIL_VV_MAG_T4          = 3025;  % Vectorview magnetometer (MEG-MRI)

FIFF.FIFFV_COIL_MAGNES_MAG         = 4001;  % Magnes WH magnetometer
FIFF.FIFFV_COIL_MAGNES_GRAD        = 4002;  % Magnes WH gradiometer
%
% Magnes reference sensors
%
FIFF.FIFFV_COIL_MAGNES_REF_MAG          = 4003;
FIFF.FIFFV_COIL_MAGNES_REF_GRAD         = 4004;
FIFF.FIFFV_COIL_MAGNES_OFFDIAG_REF_GRAD = 4005;
FIFF.FIFFV_COIL_MAGNES_R_MAG = FIFF.FIFFV_COIL_MAGNES_REF_MAG;
FIFF.FIFFV_COIL_MAGNES_R_GRAD = FIFF.FIFFV_COIL_MAGNES_REF_GRAD;
FIFF.FIFFV_COIL_MAGNES_R_GRAD_OFF = FIFF.FIFFV_COIL_MAGNES_OFFDIAG_REF_GRAD;

%
% CTF coil and channel types
%
FIFF.FIFFV_COIL_CTF_GRAD             = 5001;
FIFF.FIFFV_COIL_CTF_REF_MAG          = 5002;
FIFF.FIFFV_COIL_CTF_REF_GRAD         = 5003;
FIFF.FIFFV_COIL_CTF_OFFDIAG_REF_GRAD = 5004;
%
% KIT system coil types
%
FIFF.FIFFV_COIL_KIT_GRAD         = 6001;
FIFF.FIFFV_COIL_KIT_REF_MAG      = 6002;
%
% BabySQUID sensors
%
FIFF.FIFFV_COIL_BABY_GRAD          = 7001;
%
% BabyMEG sensors
%
FIFF.FIFFV_COIL_BABY_MAG           = 7002;
FIFF.FIFFV_COIL_BABY_REF_MAG       = 7003;
FIFF.FIFFV_COIL_BABY_REF_MAG2      = 7004;
%
% Artemis123 sensors
%
FIFF.FIFFV_COIL_ARTEMIS123_GRAD         = 7501;
FIFF.FIFFV_COIL_ARTEMIS123_REF_MAG      = 7502;
FIFF.FIFFV_COIL_ARTEMIS123_REF_GRAD     = 7503;
%
% QuSpin sensors
%
FIFF.FIFFV_COIL_QUSPIN_ZFOPM_MAG   = 8001;
FIFF.FIFFV_COIL_QUSPIN_ZFOPM_MAG2  = 8002;
%
% KRISS sensors
%
FIFF.FIFFV_COIL_KRISS_GRAD         = 9001;
%
% Compumedics adult/pediatric gradiometer
%
FIFF.FIFFV_COIL_COMPUMEDICS_ADULT_GRAD      = 9101;
FIFF.FIFFV_COIL_COMPUMEDICS_PEDIATRIC_GRAD  = 9102;

% MNE RealTime
FIFF.FIFF_MNE_RT_COMMAND           = 3700;  % realtime command
FIFF.FIFF_MNE_RT_CLIENT_ID         = 3701;  % realtime client

% MNE epochs bookkeeping
FIFF.FIFF_MNE_EPOCHS_SELECTION     = 3800;  % the epochs selection
FIFF.FIFF_MNE_EPOCHS_DROP_LOG      = 3801;  % the drop log
FIFF.FIFF_MNE_EPOCHS_REJECT_FLAT   = 3802;  % rejection and flat params

% MNE annotations
FIFF.FIFFB_MNE_ANNOTATIONS         = 3810;  % annotations block

% MNE Metadata Dataframes
FIFF.FIFFB_MNE_METADATA            = 3811;  % metadata dataframes block

